democratic nation; democratic country
Refers to a state governed by democratic principles. Often used in political or international contexts.
日本は民主主義国家です。
Japan is a democratic nation.
民主主義国家 spells out 'a state based on the system of democracy' more explicitly and formally than the shorter 民主国.
Compound of 民主主義 (democracy) and 国家 (nation, state).